Dressing device for saw teeth



April 30, 1940. v. M. TAYLOR DRESSING DEVICE FORSAW TEETH 2 Sheets-Sheet 1 Original Filed July 19, 1938 VM.TayZ07 April 30, 1940.

r v. M. TAYLOR DRESSING DEVICE FOR SAW TEETH 2 Sheets-Sheet 2 Original Filed July 19,1938

KM T619202" X Patent ed Apr. 30, '1940 UNITED STATES PATEN, pm

DRESSING'DE'VIGE FOR! SAW TEETH Victor Mitchell Taylor, Tazewelleva 1 3 u Original application July 19, 1938, Serial no. 220,103. Divided and this application vJune 1 8,1939,.SerialNo.278,137

before the teeth have been sharpened.

This invention constitutes a division of my 00- pending application entitled Device for filing circular saws, filed July 19, 1938, Serial No. 220,103.

It is a particular aim'of this invention to provide a device for dressing the saw teeth of a circular saw, before sharpening, so that the width and length of each tooth will be uniform, and more particularly to provide a dressing'apparatus particularly designed and adapted for'use in conjunction with. my device for filing circular r saws, heretofore referred to.

It is a further aimof this invention to provide a dressing device for circular saw teeth including a frame for removably and rotatably mounting a circular saw whereby the dressing operation may be accomplished while the saw is rotating. #0, A particular advantage of the invention resides inthe fact that by dressing the saw teeth to the same length and width reduces to a minimum the danger of the teeth being broken while engaged in cutting, which is frequently caused by the teeth 3 being of different lengths and widths so that a tooth that is longer or wider than the remaining teeth of a circular saw will engage a kerf that is either too shallow or too narrow toreceive the tooth normally so that frequently the tooth is 50 unable to makea cut su'fiieiently deep and wide to permit it to pass through the kerf andis thus broken off requiring replacement. On the other hand, where certain of the teeth are longer or Wider than the other teeth, the larger teeth perso form all of the cutting operation resulting in uneven rotating speed'of the blade and afiu'ctuat ing load on the power operating the blade.

Other objects and-advantages of the invention will hereinafterbecome morefully apparent from the following description of the drawings, which illustrate a preferred embodiment thereof, and

wherein-- i Figure 1' is a side elevational view, partly in section, of the dressing and jointing apparatus, 45 Figure 2 .is a transverse vertical sectionalview taken along the line 2-2 of Figure 1,

Figure 3 is an enlarged horizontal sectional view taken along the line 33 of Figure 1,

Figure, 4 is a reduced transversevertical sec- 59 tionalviewtaken along the line .44 0f Figure 3,

Figurefi is a fragmentary longitudinal sectiona1 view of a portion of the frame showing the guide means for truing the saw during rotation,

Figure 6 is an enlarged horizontal sectional on view taken along the line 6-6 of Figure 1,

Figure'lis auhorizont'al sectional view taken along the line' '|,'|'.0f Figure'4, and t l l Figure 8isa top plan view of the follower members and ofi'a'pair of files disposed therebetween; Referring more particularly to the drawings,

wherein like reference characters designateilik'e A "will be described and-illustrated'in this applicae tion. Thelframe'A includes th'erspa'ced' horizontal beams "land I I, the latter'of'which is removable by means 'ofia plurality of fastenings l2, as seen in Figure 5; A circular saw blade, designated generally I3, is adapted to; be rotatably mounted 211 between the beams 10 and H and maybe applied to or removed from the-frame A by removing' the beam II. -2Beamstl0 and 'll are held in spaced apart relationship relatively to each other by means of aplurality of'spacing sleeves 14 which- 25 are carriedbythefastenings'l2and disposedbe- I tween the beams? '10 and H "assseen in? Figure 5.- The beams 1 l0 and at a'plurality of points are provided with aligned openings-15in which areremovablymounted the sleeves I B carrying the guide 30,, I

rollers l1which'engageoppositeg'sides of thesaw' blade l3 for truing it .during rota'tion. -T Y a As best seen in Figures 1 and, 2, frame A adja--- cent one end thereof is provided with a pair of plates l8 and;l9 which'aresecured longitudinally 35-,

thereof and on the outer side of the'beam H by means of the fastenings Plate I9 is disposed on the outer side of theplate I8 andis spaced therefrom by means of the spacing sleeve 21 car-' ried by the fastenings 20.

An arm 2| is secured'to the outer side of-the beam ID at the inner ends of the platesl8 and I9 and has its upper end projectingabovethe beam Ill. The upper free end of the armZI-is provided with a bearing forming a part of the 45=,

conveyor C and adapted to form-a journal for one endof the threaded rod-23. A bearing 24 journals the rod 23 adjacent its opposite endand a pin 25 and collar 26 secured to rod 23 and en;

gaging the ends of the bearing, prevent'longi- 50 tudinal movementv of the rod relatively to its bear-v ings 22 and 24. A. crank ,21 is fixed to the-last. mentioned .end of the rod 23 for rotating .it, and,

a set screw 28-is mounted in a threaded opening in the bearing 24 and-is adaptedto'bemovedim 5 5 to clamping engagement with the rod 23 for fixing the conveyor C in adjusted position, as will hereinafter bedescribed.

The dressing and jointing mechanism B includes a carriage comprising a plate 29 having a downturned flange 30 provided with a longitudinally disposed outwardly projecting rib 3|. Plate 29 is adapted to be slidably mounted on the upper edges of the beams I0 and II with the flange 30 depending downwardly along the outer side of the beam l0 and between the plates 18 and I9. Plate I9 is provided with an inwardly projecting flange 32 at its upper edge to overlie the rib 3! to hold the flange 30 in engagement with the plates .l8 and I9 and the plate 29 in position on the beams I 0 and I l. A lug 33 extends outwardly from the flange 30 and is provided with a threaded bore 34 through which extends the rod 23 and with which the rod 23 is in threaded engagement, for reciprocating plate 29 longitudinally of the frame A by operation of the crank 21.

A plate 35 is hinged at 36 to the plate 29, intermediate of its ends, and transversely thereof. A turnbuckle 31 is adjustably connected to the threaded rods 38 and 39, the former of which is pivotally connected by means of the lug 40 to the back of the plate 35, adjacent its free end. The free end of the rod 39 is secured to one end of a supporting member M the opposite end of which is provided with a slot 42 which is adapted to be adjustably and removably connected to the back end of the plate 29 by a headed'screw fastening 43, as best seen in Figure 3.

A pair of corresponding follower members 44 are mounted longitudinally of the forward side of the plate 35, as best seen in, Figure 4. Follower members 44 each comprise a side 45 and a side 46 which are disposed at right angles to each other. Sides 46 are provided with the transverse slots 4'! which open outwardly of their free edges, as best seen in-Figure 4. A pair of lugs 48 project forwardly from each of the longitudinal edges of the plate 35 and are provided with the angularly disposed base portions 49 which are mounted transversely of the forward side of the plate 35 and which are secured thereto by means of the fastenings 50. Sides 46 of the followers 44 engage the base portions 49 of the lugs 48 and are held in position thereon by means of the fastenings 50 engaging the slots 41. The headed fastenings 50 loosely mount the followers 44 for movement transversely of the plate 35.

Set screws 5! are adjustably mounted in threaded openings 52 of the lugs 48 and are disposed with their inner adjacent ends engaging the remote faces of the sides 45 for moving the followers 4 t inwardly relatively to each other. As best seen in Figures 3 and 8, the longitudinal free edges of the sides 45 are provided adjacent their lower ends with the outwardly and inward- 1y projecting claws 5-3 and adjacent their upper ends with the inwardly extending claws 5A which are adapted to engage corresponding longitudinal edges of a pair of files 55. Files are urged outwardly and into engagement with the pairs of claws 53 and 54 by means of a follower 56 comprising a screw 5'! which is mounted in a threaded opening in the plate 35 and which is provided at its inner end with a plate 58. which engages the inner longitudinal edges of the files 55 adjacent their tops, as best seen in Figiu'e 6; and by means of a set screw 59 which likewise engages a threaded opening in the plate 35 and which is disposed between and against the inner longitudinal edges of the files 55 adjacent their bottoms. Asseen in Figure 3, set screw 59 tends to urge the inner edges of the files 55 outwardly of each other, for a purpose which will hereinafter be described. As best seen in Figures 6, '7 and 8 a plurality of set screws 60 are mounted in threaded openings in the sides 45 for engaging the remote sides of the files 55 and are adjustable relatively to sides 45 for swinging the inner longitudinal edges of the files inwardly of each other to angularly adjust them as desired, after which the set screw 55) is moved in the position as seen in Figure 3, to clamp the files in adjusted position. Files 55 are ordinarily canted at about an angle as seen in Figures 3, 6, 7 and 8 for a purpose which will hereinafter be described.

As best seen. in Figure 1, a bar 6! is mounted on the upper edge of each of the sides 45 and have their corresponding ends extending outwardly beyond the sides A5 and provided with inwardly opening notches 62 which are adapted to receive thelongitudinal edges of a file 63, the lower end of which rests on the lower claws 53. A set screw 54 is adjustably mounted in a threaded opening adjacent the top of the plate 35 and is provided with a. head or socket for engaging the file 53 adjacent its upper end, to urge said end outwardly to hold the opposite end inwardly andin clamping engagement with the claws 53. File 63 is disposed in a plane substantially parallel to the plane of the plate 35, as seen in Figure 1.

As best seen in Figure 4. carrier plate 29 is provided with a slot 65 which extends from adjacent the hinge 35 forwardly through the forward edge of the plate 29 and which is disposed ccntrally thereof and beneath the followers 44.

From the foregoing it will be seen, that by operating crank 2i carrier plate 29 can be moved forwardly or rearwardly of the frame A to position a portion of the periphery of the circular saw 13 in its slot 65. Crank 2! is adjusted until one of the'removable saw teeth 61 of the saw i3 is in contact with the file 63 after which set screw 28 is tightened to clamp the follower plate 29 in adjusted position and the turnbuckle 3'! is then adjusted to angularly adjust the plate 35 and file 63 ,to the desired angle. Saw i3 is then revolved in the frame A in a clockwise direction, as seen in Figure 1, so that the direction of movement of the saw !3 is opposite to its normal direction of movement for cutting. By thus revolving the saw E3 the back edge of each of the teeth 31 will be dressed to substantially the same length, after which set screw 28 is loosened and the crankfil moved to advance the file 63 slightly. The operation of revolving the saw i3 is then repeated to insure dressing the back edges of each of the teeth 61 to the same length. Set screw 64 is then retracted to release file 63 which is removed, after which conveyor C is actuated to ad- Vance the follower plate 29 to position one of the teeth 6'! between the files 55. which are adjusted as heretofore described to any angle desired by operation of the set screw 60 and set screw 59. The saw I3 is again revolved in a reverse direction to cause the sides of the teeth 6'! tobe dressed to a uniform. thickness and the followers 44 may be moved inwardly by turning set screws 5i and slightly loosening screw 59, during this operation, to insure that both sides of each tooth 5T will-be dressed. In this way, each tooth 61 is dressed and jointed to-a uniform width and length. v

As heretofore mentioned, the dressing and jointing mechanism constitutes the final step'of sharpening teeth of a circular saw and is adapted to be used in conjunction with a sharpening ap paratus, especially the apparatus disclosed in my co-pending application, heretofore referred to.

Various modifications and changes in the construction and arrangement of the parts forming the invention are contemplated and may be resorted to and the right is reserved to make such variations as do not depart from the spirit and scope of the invention as hereinafter defined by the appended claims.

I claim as my invention:

1. A saw tooth dressing device comprising a frame for rotatably mounting a circular saw, a

carriage slidably mounted on said frame, a plate pivotally mounted on said carriage and rising therefrom, means connected to said plate and carriage for angularly adjusting the plate relatively to the carriage, claws disposed longitudinally of said plate for supporting a pair of files in opposed spaced relationship, said claws being slidably-mounted laterally of said plate, means for adjustably positioning said claws relatively to each other, and means carried by said claws for engaging and angularly adjusting the files relatively to each other.

2. A device as in claim 1 comprising a follower, a screw conveyor mounted in saidplate for actuating said follower, said follower engaging corresponding longitudinal edges of said files for retaining them in adjusted positions relatively to each other.

3. A saw filing apparatus comprising a carriage slidably mounted on a circular saw supporting frame, a plate pivotally connected to said carriage and rising therefrom, means connected to the carriage for angularly adjusting the plate relatively to the carriage and for retaining the plate in adjusted position, file supporting claws disposed longitudinally of said plate and slidably mounted laterally thereof, means carried by the plate for actuating said claws" for adjustably positioning them relatively to each other, and file clamping means carried by said plate, and including a follower mounted therein, for co-acting with said claws.

4. In a saw filing device, a carrier having a slot in its forward end, adapted to be slidably mounted on a saw support and disposed in substantially a horizontal position, a plate hinged to said carrier intermediate of its ends and projecting upwardly therefrom, means to support and angularly adjust said plate relatively to the carrier; claws mounted longitudinally of said plate, in opposed relationship, and slidably mounted transversely thereof, set screws connected to said claws to adjustably position them relatively to each other, said claws being adapted to support files in opposed relationship to each I,

other, and means movably mounted in said claws to engage said files to angularly adjust them relatively to each other, said files being positioned above the slot in said carrier, and beingadapted to engage the teeth of a circular saw, mounted in said frame, as it is revolved, the slot forming a space through which the teeth pass after being engaged by the files.

5. A dressing device for circular saws, comprising a file supporting mechanism including a plate, followers mounted longitudinally of said plate and slidably mounted transversely thereof, said followers having inwardly projecting spaced fingers for engaging corresponding portions of files mounted in opposed relationship between said followers, said files being adapted to engage the teeth of a circular saw, set screws carried by said followers for engagement withv the files to angularly adjust themrelatively to each other, and means mounted in said supporting mechanism and adjustable relatively thereto for retaining the files in adjusted position.

6. In a saw filing apparatus, a frame for removably and rotatably mounting a circular saw, a carriage slidably mounted on the frame adjacent one end thereof, a screw conveyor journaled in the frame and connected to the carriage for moving it toward and away from the saw, a plate pivotally connected at one end to the carriage and rising therefrom, means pivotally connected to the plate and detachably connected to the carriage for retaining the plate in an upright position and for angularly adjusting it relatively to the carriage, angle members disposed longitudinally .of said plate and slidably mounted laterally thereof, follower means carried by the plate for moving said angle members toward and away from each other, fingers carried by said angle members for removably supporting files, and means adjustably mounted in the plate forreleasably clamping the files in the claws.

VICTOR M. TAYLOR. 

